Hi And Thank You For Your Expertise. I Am 45yrs

Hi and thank you for your expertise. I am 45yrs old. My menstruation in the last few months have been extremely heavy so i took iron for that. I had 2 periods in one month.
My boyfriend and I was having our intimate moment. He was fingering my vagina and his hand was covered with blood. I was not on my menstrual. Can you please explain what is going on with my body. Thanks.